Coherent state quantum key distribution based on entanglement sudden death

Coherent state quantum key distribution based on entanglement sudden death
Jaeger, Gregg; Simon, David; Sergienko, Alexander
2015-07-16 00:00:00
A method for quantum key distribution (QKD) using entangled coherent states is discussed which is designed to provide key distribution rates and transmission distances surpassing those of traditional entangled photon pair QKD by exploiting entanglement sudden death. The method uses entangled electromagnetic signal states of ‘macroscopic’ average photon numbers rather than single photon or entangled photon pairs, which have inherently limited rate and distance performance as bearers of quantum key data. Accordingly, rather than relying specifically on Bell inequalities as do entangled photon pair-based methods, the security of this method is based on entanglement witnesses and related functions.
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Coherent state quantum key distribution based on entanglement sudden death